Why would Australians say this? Is it because for them an exam is a "she"? (disclaimer: not a native English speaker myself, though the test guessed "American English (Standard)").

I don't know the origins, but we seem to use 'she' as a synonym for 'the situation'.

She'll be right. She's all good. She's apples.

etc.

Idiom: “she’ll be right, mate.” It’s generic, meaning “it will be alright.”

Despite all this, it still reckoned me en-NZ before en-AU. Oh, the shame! 😉

I clicked "She'll be right!" just to test if this was true and none of the results guess me to be Australian. I had originally thought the same as you did but was pleasantly surprised.

Being Australian, I selected that answer but it actually guessed I was a New Zealander first (2 and 3 were Australian and South African respectivly)

I didn't pick that option and it still put my number 2 dialect as Australian.

The other option was to ask "_________ Oi! Oi! Oi!"

Yeah, that one was rather fishy.

It guessed correctly that I was Australian.

She'll be apples when she discovers this.